Don't understand battery ratings.  
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Don't understand battery ratings. - 12/31/2002 6:14:09 AM   
Dekz


 

Posts: 92
Joined: 12/15/2002
From: Kelowna, BC,
Status: offline 		Well when I got my car for xmas it had an 1800 MAH battery pack with it and once I put my 14T speed gem in it that battery doesn't last very long at all, so I bought a 2400. Now I understand that the 2400 should last longer, but I don't understand why it makes the car faster. Can anyone explain in detail how the battery rating system works?

Also me and my friends pretty much tell if a battery is charged by when it gets pretty warm (usually akes 20-30 mins. Wel this new pack I got can be on the charger for like 50 mins and it doesn't get warm at all, what's with that?


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Don't understand battery ratings. - 12/31/2002 3:05:55 PM   
GotCoffee66



Posts: 122
Joined: 12/16/2002
From: Twentynine Palms, CA, USA
Status: offline 		1800mAH refers to milliAmp Hour. That means that your 1800mAH battery putts out 1.8Amps per hour. So if it only last 15 minutes, your motor and ESC is drawing 7.2 amps.
With you 2400mAH battery, your motor has more Amps to draw from so will be faster and the battery pack will die quicker. The new battery back probably has a lower internal resistance giving you more Amps to the motor. Ohms law: I=E/R. I'm guessing that both packs are 6 cells at 7.2V (E in the equation, i.e 1.2v per NiCd cell). P=IE which is total power in watts = current (mAH) * Voltage (which should stay around 7.2V with the six cell battery pack) therefore your 2400mAH pack will have more "power" than your 1800mAH pack.
Since your 1800mAH battery charges in 30 minutes, your 2400mAH battery "should" charge in about 40-50 minutes with the same charger. I'm only a beginner so may be wrong

< Message edited by GotCoffee66 -- Dec 31 2002 10:18AM >

(in reply to Dekz)
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Don't understand battery ratings. - 1/5/2003 2:52:58 AM   
metalone


 

Posts: 4
Joined: 1/5/2003
From: Fountain Valley, Ca
Status: offline 		The analysis is correct with one exception, batteries with higher capacity ie. 2400mAh - vs - 1800mAh, does not make your car automatically faster. The average discharge voltage and the internal resistance of the battery is what determines how much power is delivered to the motor (just speeking of batteries). The higher capacity determines how much longer the battery will run. A bad set of 2400's will make your car run slow for a long time, and this is the case for any capacity battery.

(in reply to Dekz)
       Post #: 3

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